Except for the gunman's wife, there was no immediate word on how the victims might have been related.

Sheriff Youngblood later told reporters his team was carrying out an investigation into the mass shooting.

"Obviously there's some type of situation that caused the husband to be extremely upset", Youngblood said, adding that he's confident of a connection between those involved. The deputy who confronted the man was wearing a body camera.

It was also not known what had sparked the shootings, which saw all six people die in a short amount of time, Mr Youngblood said.

About 30 people saw the shootings and were being interviewed by deputies, Youngblood said.

The Kern County Sheriff's Office held a press conference Wednesday night and said the investigation is ongoing, but investigators are confident the shootings are connected.

He shot both of them dead, police said. "This is highly unusual", he said.

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